<!DOCTYPE html>
<html>
<head>
    <meta charset='utf8'/>
    <title>
        {% block title %}{% endblock %}
    </title>
</head>
    <h1>blog</h1>
    {% block content %}{% endblock %}
    {% block footer %}
        {# 任何每个页面都可能修改的文本区域的页脚 #}
        <p>Thanks for visiting my site! </p>
    {% endblock %}
<body>
</body>
</html>